<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.13"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>libfuse: example/cuse_client.c Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td id="projectalign" style="padding-left: 0.5em;">
   <div id="projectname">libfuse
   </div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.13 -->
<script type="text/javascript" src="menudata.js"></script>
<script type="text/javascript" src="menu.js"></script>
<script type="text/javascript">
$(function() {
  initMenu('',false,false,'search.php','Search');
});
</script>
<div id="main-nav"></div>
<div id="nav-path" class="navpath">
  <ul>
<li class="navelem"><a class="el" href="dir_cfafba98a580ce4b62f8a6fa96d7cbb0.html">example</a></li>  </ul>
</div>
</div><!-- top -->
<div class="header">
  <div class="headertitle">
<div class="title">cuse_client.c</div>  </div>
</div><!--header-->
<div class="contents">
<a href="cuse__client_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">  FUSE fioclient: FUSE ioctl example client</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">  Copyright (C) 2008       SUSE Linux Products GmbH</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">  Copyright (C) 2008       Tejun Heo &lt;teheo@suse.de&gt;</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">  This program can be distributed under the terms of the GNU GPL.</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">  See the file COPYING.</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="preprocessor">#include &lt;sys/types.h&gt;</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="preprocessor">#include &lt;fcntl.h&gt;</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="preprocessor">#include &lt;sys/stat.h&gt;</span></div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="preprocessor">#include &lt;sys/ioctl.h&gt;</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="preprocessor">#include &lt;ctype.h&gt;</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="preprocessor">#include &lt;errno.h&gt;</span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ioctl_8h.html">ioctl.h</a>&quot;</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="keyword">const</span> <span class="keywordtype">char</span> *usage =</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="stringliteral">&quot;Usage: cuse_client FIOC_FILE COMMAND\n&quot;</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="stringliteral">&quot;\n&quot;</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="stringliteral">&quot;COMMANDS\n&quot;</span></div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="stringliteral">&quot;  s [SIZE]     : get size if SIZE is omitted, set size otherwise\n&quot;</span></div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="stringliteral">&quot;  r SIZE [OFF] : read SIZE bytes @ OFF (dfl 0) and output to stdout\n&quot;</span></div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="stringliteral">&quot;  w SIZE [OFF] : write SIZE bytes @ OFF (dfl 0) from stdin\n&quot;</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="stringliteral">&quot;\n&quot;</span>;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="keyword">static</span> <span class="keywordtype">int</span> do_rw(<span class="keywordtype">int</span> fd, <span class="keywordtype">int</span> is_read, <span class="keywordtype">size_t</span> size, off_t offset,</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                 <span class="keywordtype">size_t</span> *prev_size, <span class="keywordtype">size_t</span> *new_size)</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;{</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="keyword">struct </span>fioc_rw_arg arg = { .offset = offset };</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        ssize_t ret;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        arg.buf = calloc(1, size);</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="keywordflow">if</span> (!arg.buf) {</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;                fprintf(stderr, <span class="stringliteral">&quot;failed to allocated %zu bytes\n&quot;</span>, size);</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;                <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        }</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;        <span class="keywordflow">if</span> (is_read) {</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;                arg.size = size;</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;                ret = ioctl(fd, FIOC_READ, &amp;arg);</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;                <span class="keywordflow">if</span> (ret &gt;= 0)</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                        fwrite(arg.buf, 1, ret, stdout);</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                arg.size = fread(arg.buf, 1, size, stdin);</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                fprintf(stderr, <span class="stringliteral">&quot;Writing %zu bytes\n&quot;</span>, arg.size);</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;                ret = ioctl(fd, FIOC_WRITE, &amp;arg);</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        }</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keywordflow">if</span> (ret &gt;= 0) {</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;                *prev_size = arg.prev_size;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;                *new_size = arg.new_size;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        } <span class="keywordflow">else</span></div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;                perror(<span class="stringliteral">&quot;ioctl&quot;</span>);</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;        free(arg.buf);</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        <span class="keywordflow">return</span> ret;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;}</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;{</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        <span class="keywordtype">size_t</span> param[2] = { };</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        <span class="keywordtype">size_t</span> size, prev_size = 0, new_size = 0;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        <span class="keywordtype">char</span> cmd;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        <span class="keywordtype">int</span> fd, i, rc;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        <span class="keywordflow">if</span> (argc &lt; 3)</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;                <span class="keywordflow">goto</span> usage;</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        fd = open(argv[1], O_RDWR);</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        <span class="keywordflow">if</span> (fd &lt; 0) {</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;                perror(<span class="stringliteral">&quot;open&quot;</span>);</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;                <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;        }</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        cmd = tolower(argv[2][0]);</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        argc -= 3;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        argv += 3;</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;        <span class="keywordflow">for</span> (i = 0; i &lt; argc; i++) {</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;                <span class="keywordtype">char</span> *endp;</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;                param[i] = strtoul(argv[i], &amp;endp, 0);</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;                <span class="keywordflow">if</span> (endp == argv[i] || *endp != <span class="charliteral">&#39;\0&#39;</span>)</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;                        <span class="keywordflow">goto</span> usage;</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;        }</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        <span class="keywordflow">switch</span> (cmd) {</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;        <span class="keywordflow">case</span> <span class="charliteral">&#39;s&#39;</span>:</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;                <span class="keywordflow">if</span> (!argc) {</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;                        <span class="keywordflow">if</span> (ioctl(fd, FIOC_GET_SIZE, &amp;size)) {</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;                                perror(<span class="stringliteral">&quot;ioctl&quot;</span>);</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;                                <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;                        }</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                        printf(<span class="stringliteral">&quot;%zu\n&quot;</span>, size);</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;                } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;                        size = param[0];</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;                        <span class="keywordflow">if</span> (ioctl(fd, FIOC_SET_SIZE, &amp;size)) {</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;                                perror(<span class="stringliteral">&quot;ioctl&quot;</span>);</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;                                <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;                        }</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;                }</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;                <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        <span class="keywordflow">case</span> <span class="charliteral">&#39;r&#39;</span>:</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        <span class="keywordflow">case</span> <span class="charliteral">&#39;w&#39;</span>:</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;                rc = do_rw(fd, cmd == <span class="charliteral">&#39;r&#39;</span>, param[0], param[1],</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;                           &amp;prev_size, &amp;new_size);</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;                <span class="keywordflow">if</span> (rc &lt; 0)</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;                        <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;                fprintf(stderr, <span class="stringliteral">&quot;transferred %d bytes (%zu -&gt; %zu)\n&quot;</span>,</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;                        rc, prev_size, new_size);</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;                <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;        }</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160; usage:</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;        fprintf(stderr, <span class="stringliteral">&quot;%s&quot;</span>, usage);</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;}</div><div class="ttc" id="ioctl_8h_html"><div class="ttname"><a href="ioctl_8h.html">ioctl.h</a></div></div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.13
</small></address>
</body>
</html>
